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Submerged arc welding wire for superstrength pipeline steel and production method thereof

An ultra-high-strength, pipeline steel technology, applied in the direction of arc welding equipment, welding equipment, welding equipment, etc., to achieve the effect of increasing the number, refining grains, and improving strength and toughness

Inactive Publication Date: 2011-05-25
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there is no published invention patent for submerged arc welding wire with a tensile strength exceeding 900MPa and suitable for welding X120 pipeline steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] A submerged arc welding wire for ultra-high strength pipeline steel and a preparation method thereof, the chemical composition of the submerged arc welding wire is: C is 0.04-0.05wt%, Mn is 1.80-2.00wt%, and Mo is 0.90-1.00wt% %, Ni is 2.00~2.20wt%, Cr is 0.80~0.90wt%, Cu is 0.20~0.30wt%, B≤0.0005wt%, S≤0.01wt%, P≤0.01wt%, the balance is Fe and not Avoid impurities.

[0014] The composite additive is added in the form of a cored wire. The chemical composition and content of the composite additive are: Si is 45-50wt%, Ti is 20-25wt%, Zr is 30-35wt%, and the rest is Fe and unavoidable impurities

[0015] The preparation process of the submerged arc welding wire is as follows: first smelting according to the above chemical composition, adding 0.01-0.5wt% compound additive of the composition during the smelting process, then pouring into a billet, and then hot rolling into Φ5.5~Φ7 .5mm wire rod, remove the surface scale, draw it into Φ3.2~Φ4.0mm welding wire, and finally c...

Embodiment 2

[0019] A submerged arc welding wire for ultra-high strength pipeline steel and a preparation method thereof, the chemical composition of the submerged arc welding wire is: C is 0.04-0.05wt%, Mn is 1.40-1.60wt%, and Mo is 1.00-1.10wt% %, Ni is 2.20~2.40wt%, Cr is 1.10~1.20wt%, Cu is 0.10~0.20wt%, B≤0.0005wt%, S≤0.01wt%, P≤0.01wt%, the balance is Fe and not Avoid impurities.

[0020] The composite additive is added in the form of cored wire. The chemical composition and content of the composite additive are: Si is 55-60wt%, Ti is 25-30wt%, Zr is 25-30wt%, and the rest is Fe and unavoidable impurities .

[0021] The preparation process of this embodiment, the welding process of the prepared welding wire and the welded steel plate are the same as those of Embodiment 1.

[0022] After welding, analyze the mechanical properties of the welded joint and the microstructure of the weld metal: the tensile strength of the weld metal is 998MPa, the elongation A=15%, and the impact energy...

Embodiment 3

[0024]A submerged arc welding wire for ultra-high strength pipeline steel and a preparation method thereof. The chemical composition of the submerged arc welding wire is: C is 0.05-0.06 wt%, Mn is 1.60-1.80 wt%, and Mo is 0.80-0.90 wt%. %, Ni is 2.00~2.20wt%, Cr is 0.90~1.00wt%, Cu is 0.20~0.30wt%, B≤0.0005wt%, S≤0.01wt%, P≤0.01wt%, the balance is Fe and not Avoid impurities.

[0025] The composite additive is added in the form of cored wire. The chemical composition and content of the composite additive are: Si is 60-70wt%, Ti is 10-15wt%, Zr is 15-20wt%, and the rest is Fe and unavoidable impurities .

[0026] The preparation process of this embodiment, the welding process of the prepared welding wire and the welded steel plate are the same as those of Embodiment 1.

[0027] After welding, analyze the mechanical properties of the welded joint and the microstructure of the weld metal: the tensile strength of the weld metal is 1005MPa, the elongation A=16%, and the impact en...

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Abstract

The invention relates to a submerged arc welding wire for superstrength pipeline steel and a production method thereof. The technical scheme is that: the submerged arc welding wire comprises the following components in percentage by weight: 0.04 to 0.06 percent of C, 1.40 to 2.00 percent of Mn, 0.70 to 1.10 percent of Mo, 2.00 to 2.60 percent of Ni, 0.80 to 1.20 percent of Cr, 0.10 to 0.30 percent of Cu, less than or equal to 0.0005 percent of B, less than or equal to 0.01 percent of S, less than or equal to 0.01 percent of P and the balance of Fe and inevitable impurities. The production method comprises the following steps of: adding 0.01 to 0.5 weight percent of composite additive when the components are smelted, forming a square billet in a pouring way, hot-rolling the square billet to form a steel wire rod with the diameter of Phi 5.5 to Phi 7.5mm, removing oxide skin from a surface, drawing the steel wire rod to form the welding wire with the diameter of Phi 3.2 to Phi 4.0mm and performing copper plating, wherein the composite additive is added in form of cored wire. The welding wire produced by the method is welded together with an SJ105 welding flux so as to achieve the tensile strength sigmab of more than or equal to 910MPa and the impact toughness Akv at -30 DEG C of more than or equal to 84J of a weld metal, and is suitable for the submerged arc welding of X120 pipeline steel with superstrength.

Description

technical field [0001] The invention belongs to the technical field of submerged arc welding wire. Specifically relates to a submerged arc welding wire for ultra-high strength pipeline steel and a preparation method thereof Background technique [0002] With the adjustment of my country's energy structure and the demand for environmental protection, the demand for natural gas continues to increase. In order to meet the needs of future natural gas pipeline construction, in recent years, my country has invested a lot of manpower and material resources in the research, development and production of pipeline steel. At present, pipeline steels of various strength grades such as X60, X65, X70, and X80 have been developed and produced, and have been successfully applied to the first and second lines of the West-East Gas Pipeline Project. The research data shows that the ultra-high-strength pipeline steel can greatly reduce the wall thickness and quality compared with the low-stre...

Claims

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Application Information

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IPC IPC(8): B23K35/30B23K35/40B23K9/18
Inventor 王红鸿钱勇雷玄威吴开明鲁科明黄刚童明强胡锋万响亮
Owner WUHAN UNIV OF SCI & TECH
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